Continuously variable transmission

Abstract

Provided is a continuously variable transmission capable of solving a technical problem in which upon activation of a continuously variable transmission, speed increase in vaned-wheel power density is low and unable to meet the requirement for rapidly increasing output torque. The present continuously variable transmission comprises a planetary gear set (101) at an input end and a planetary gear set (102) at an output end. A planetary carrier (104) having a cavity is provided between the planetary gear set (101) at the input end and the planetary gear set (102) at the output end. The planetary carrier (104) comprises an input end cover (6) and an output end cover (13). A vaned-wheel housing (14) having a cavity is fixed between the input end cover (6) and the output end cover (13). An inner side of the planetary gear set (101) at the input end is connected to the input end cover (6). An inner side of the planetary gear set (102) at the output end is connected to the output end cover (13). A vaned-wheel-based planetary gear set (103) is provided at one internal side of the vaned-wheel housing (14).

Description

RELATED APPLICATIONS[0001]This application is a United States National Stage Application filed under 35 U.S.C 371 of PCT Patent Application Serial No. PCT / CN2018 / 077818, filed Mar. 2, 2018, which claims Chinese Patent Application Serial No. CN 201710342266.8, filed May 16, 2017, the disclosure of all of which are hereby incorporated by reference in their entirety.BACKGROUND OF THE INVENTIONField of the Invention[0002]The present invention relates to a mechanical transmission apparatus and more particularly, to a continuously variable transmission.Description of the Related Art[0003]In the field of transmission, transmissions are applied most widely in the automobile field. At present, automotive transmissions are classified according to manipulation manner into: manual transmission (MT), automatic transmission (AT) and manual automatic integrated transmission. With the rapid development of automobiles from day to day, the automatic transmission has gradually occupied a mainstream of...

AI Technical Summary

Benefits of technology

This design enables zero-speed activation, rapid torque multiplication, wide torque range adjustment, and self-adaptive matching of torque and speed, suitable for high-power flexible transmission without the need for complex control systems.

Problems solved by technology

(1) In the hydraulic torque converter, the power is transmitted to a pump wheel which is connected to housing, the pump wheel agitates a fluid in the torque converter and drives, through a guide wheel, a turbine to rotate, and then the turbine outputs the power. The disadvantage thereof is that: when a difference between rotation speeds of the pump wheel and the turbine of the hydraulic torque converter is close to synchronization, transmission capacity will be lost and synchronization can't be achieved; however, when a control system is added to overcome the above existed problems of the hydraulic torque converter, it further causes problems of complicated system and high manufacturing cost.

(2) The existing continuously variable transmission (CVT) transmits power by using a transmission belt in which driving and driven wheels having variable transmission friction forces and working diameters cooperate with each other, and may achieve a continuously change of transmission ratio, thereby obtaining a best match of power train and engine working conditions. The disadvantage thereof is that: flexibly activation with zero can't be provided, a large torque can't be provided, and it tends to slip when the applied force changes frequently.

(3) Chinese Patent No. 102606709B discloses a hydraulic double-speed synchronizer, the disadvantage of which is that: the balance force between the bucket wheel and the fluid is limited, and the torque may only be changed within the maximum balance force of the fluid to the bucket wheel; the fluid in the inner casing needs to be discharged when the output shaft needs to provide a torque larger than the torque that the maximum balance force of the fluid to the bucket wheel can provide, and the gear mechanism participating in braking has a conventional structure of a planetary gear reducer which does not have a flexible transmission function; and the entire control system belongs to a electronic control system, and the structure of the apparatuses for control, braking and the like are complicated.

(4) Chinese invention application No. 201710055648.2 filed by the applicant discloses a continuously variable transmission, and the technical solution thereof is that the bucket wheel planetary gear set is located on the side close to the cavity output end cover. The disadvantage of this structure is that: when the transmission system is in a condition where a rapid increase of output torque is required upon activation or acceleration, the revolution speed of the cavity planetary gear carrier is reduced in proportion while the input end planetary gear set and the output end planetary gear set achieve the increase of the torque through enlargement of diameter twice, and the rotation speed of the bucket wheel planetary gear is dependent on the revolution speed of the cavity planetary gear carrier, thereby, the increase of the power density of the bucket wheel is slow in this structure, and it is not suitable for the condition where a rapid increase of output torque is required.

Images